Android中的OkHttpClient

Question

我編寫了以下代碼，將請求發送到服務器並從服務器獲取響應。 但是，當我運行以下代碼時，它對我不起作用。 我基於此鏈接編寫了此代碼。

public class MainActivity extends Activity {
    @Override
    protected void onCreate(Bundle bundle) {
        super.onCreate(bundle);
       setContentView(R.layout.activity);
       Button button = (Button)findViewById(R.id.bu1);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                try {
                    run();
                } catch (Exception e) {
                Toast.makeText(getApplicationContext(),"Error",Toast.LENGTH_LONG).show();
                }
            }
        });
    }
    private final OkHttpClient client = new OkHttpClient();
    public void run() throws Exception {
        Request request = new Request.Builder()
                .url("http://127.0.0.1:8080/file.php")
                .build();

        Call call = client.newCall(request);
        Response response = call.execute();

        if (!response.isSuccessful()) {
            throw new IOException("Unexpected code " + response);
        }
        String text = response.body().string();
        Toast.makeText(getApplicationContext(), text, Toast.LENGTH_SHORT).show();
    }


}

Answer 1

通常錯誤是因為：

1. 沒有Internet權限

2. 它在UI線程中

您可以在logcat中進行確認。

解：

1. 添加清單<uses-permission android:name="android.permission.INTERNET" />

2. 您必須在其他線程中運行或使用如下所示的異步線程：

    public void run() { Request request = new Request.Builder() .url("http://127.0.0.1:8080/file.php") .build(); Call call = client.newCall(request); call.enqueue(new Callback() { @Override public void onFailure(Request request, IOException e) { Log.d("TAG", "Failed: " + e.getMessage()); } @Override public void onResponse(Response response) throws IOException { Log.d("TAG", "OK: " + response.body().string()); } } }